Probelm with banners

This is my forum

http://legoland.forumandco.com/forum.htm

On the right side I made some banners. Sometimes they remain within the column width, sometimes they go out of the column width. How can I made them remain within column width?

This is rught.


This is wrong.


And this is the code I use in that widget.

<a href="http://www.lego.com/en-US/default.aspx" target="_blank"><img src="http://cache.lego.com/eng/images/globalNav/070x070_logo.gif" width="40" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a><a href="http://www.bricklink.com/" target="_blank"><img src="http://www.bricklink.com/images/logo.gif" width="80" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a><a href="http://starwars.wikia.com/wiki/Main_Page/" target="_blank"><img src="http://4.bp.blogspot.com/_UUnqP3MXR6g/RsVuEBVA7vI/AAAAAAAAARg/pvxsVfhLpmQ/s320/wookipedia.gif" width="40" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a><a href="http://www.forum.binaryspace.co.cc/" target="_blank"><img src="https://2img.net/r/ihimizer/img149/5682/binaryspaceforumlogo.jpg" width="160" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a><a href="http://www.formula1.com//" target="_blank"><img src="http://cdn.lastminute.com/site/sport_F1_logo_48.jpg" width="40" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a><a href="https://www.facebook.com//" target="_blank"><img src="http://ian.hember.name/facebook.gif" width="40" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a><a href="http://www.freestampcatalogue.com/app" target="_blank"><img src="https://2img.net/r/ihimizer/img21/3383/69964167.jpg" width="40" height="40" alt="Vist Lego, the website dedicated to Lego bricks " border="0"></a>

Enter in <br> after every 1 or 2 affiliate button codes. Also keep the whole code centered by placing <center> at the very beggining of the whole code you have, and </center> at the end of the whole code you have.

Thanks